I just got a new 256gb SSD on my Macbook Pro, Early 2011 and moved the 500gb HDD to the optical bay. I erased both SSD and HDD (after taking backups) and made fresh install of Mountain Lion to the SSD (backups are on Snow Leopard). My wish is to take full advantage of having an SSD while not shortening its life with bad practice. (already enabled TRIM). I am trying to decide which is better: 1- to move only certain user folders to the HDD, and keep alias or soft links (symlink?) on the SSD, or 2- to move the complete home folder what is the difference and the benefits of one over the other? Also, I have a spare admin user for emergencies. So, can I leave the secondary admin user in SSD to be used if something goes wrong with the HDD one day? Finally, once I have the skeleton ready, depending on my choice above, I will manually carry my user files to the HDD and install applications fresh to ML. Will programs like iTunes in ML recognise the backed up iTunes folders, which got backed up with SLeopard, keeping the tags, stars, play counts etc? I use the computer for my video and photography work. Lot's of Lightroom photo work, increasingly Photoshop, and Adobe Premier / Final Cut 7 on the video side. This means heavy cache that change somewhat frequently, particularly on photos. However, all my original files are on external drives. thanks in advance.